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Weights and Measurements

Dimensions (Approx.) : 3 1/8 x 2 1/8” (78 x 53.5mm)

Weight (Approx.) : 10 oz (285g)

Features

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Circular Aperture

When changing your aperture to defocus the background, the light sources appear blurred. This ‘bokeh’ effect of the blurred background can be enhanced with circular aperture blades used in this lens. Conventional aperture blades have flat sides creating unappealing polygonal shaped defocussed points of light. α lenses overcome this problem through a unique design that keeps the aperture almost perfectly circular from its wide-open setting to when it is closed by 2 stops. Smoother, more natural defocusing can be obtained as a result.

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Rear focusing elements

Only the rear groups of the optical system move to focus the lens, which allows for speedy AF operation and a shorter minimum focusing distance. Since the front of the lens does not rotate, operability is improved when shooting with a polarizing filter attached.

Rated 4.2 out of 5 by 5
reviewers.

Rated 4 out of 5 by illy Quality for the Price
I purchased this lens for my a99 body for the purpose of capturing indoor photography of subjects (head to toe). I found my 50mm f1.4 and a CZ 85mm f1.4 lenses are both great in low light, but I find myself really constrained when trying to distance myself from my subject (especially in a 10x10 sized room). With this 20mm, I can stand approx. 3-4 feet and be able to capture the full subject in frame.
The issue is with the amount of light indoor shooting provides. I certainly recommend a flash as dropping the ISO (below 800) at full aperture will not help. Additionally, in poor lighting conditions, the AF is a pain and MF will need to be used.
However, with optimal lighting, this lens has very crisp images, even at the corners. Very impressive! I would recommend this to users for outdoor photography or indoor flash photography needing a comfortable distance from their subjects while capturing a large focus area.
March 20, 2013

Rated 4 out of 5 by chefemzman Good but not great...
The reason I purchased this lens was for landscape and architectural shoots. I purchased the lens a few days before the 4th of July. I used this lens with my a77 along with the 16-50 kit lens on my a7 for that evening, alternating shots during the fireworks display. The photos turned out pretty good. I really haven't been able to use the lens much since because of my work load. Maybe after 6 months, I'll do another review.
July 18, 2014

Rated 5 out of 5 by PhotoNur Very light, fast , good focus lens
This is a light weight, compact lens. If you are looking for wide angle, fast lens this is the lens for you. Photos come very sharp in low light condition using F/2.8. It is easy to carry around, good to take landscape photos as well as architecture. Comparing with Sony 11-18mm f/4.5-5.6 Zoom Lens, vignetting at the edges and distortion is almost none. The bokeh is really nice on the background of your main subject. would recommend this lens if you are into architecture or landscape photography.
May 9, 2011

Rated 5 out of 5 by psstudio I would definitely recommand this lens
The Sony 20 mm F/2.8 makes a very good and relatively low cost super-wide angle lens. For most people, it's wide enough and fast enough. I would definitely recommend this lens.
October 24, 2011

Rated 3 out of 5 by DjD808 Not yet, but soon!
I haven't had a chance to use the lens yet, I have a wedding to go to in the San Juan Islands...more to come...
August 13, 2014